If the fertilizer does not contain phosphate or potassium, such as organic fertilizers, the label will indicate the hypothetical weight of phosphate or potassium that would provide the same amount of P or K. For example, a bag of kelp meal fertilizer with an NPK label of 1-0-2 would contain the same amount of potassium as a bag which contains 2% potash by weight. The fertilizer calculator helps you determine how much fertilizer per acre (or 1000 sq ft) to apply. While it may seem easier to follow general fertilizer recommendations, you can get a more accurate picture of how much of each nutrient your soil has from a soil test. square foot lawn. Be sure to subtract your home and any other hardscapes from the total area to determine the area of your lawn, then return to the fertilizer app. You must ensure that the units for the lawn area match the units used for the application rate, but you won't need to worry about converting units if you use our fertilizer calculator! In the water, fertilizer provides food for algae. However, keep in mind that established lawns do not require additional phosphorus (the middle number) and should be avoided. Generally, for seasonal climates with winters below 55 °F (13 °C), the best time to fertilize is in the fall. ______ pounds of your selected fertilizer to cover your For example, if you had a fertilizer with NPK ratio of 28-0-6, and wanted to find out how much fertilizer per acre you need to reach an N application rate of 43 lbs/acre, you would calculate: 43 lbs N/acre / (28/100) = 154 lbs fertilizer/acre, 2. Average normal pace is 2.5 feet. How does this happen? You can use it to: Calculate the weight of fertilizer materials to supply the amounts of N, P 2 O 5, and K 2 O recommended by a soil test report. Phosphorus is an important component in photosynthesis, energy metabolism, and structural integrity. Potassium deficiency can lead to yellowing or browning of the leaf tips and margins and weaker stems. ______ Requirements for phosphorus and potassium (the third number) should always be based on a soil test. This helps to maintain good water quality for your community. Soil testing your lawn can prevent unnecessary fertilizer applications. The fertilizer calculator also has a convenient bonus feature, where, if you enter in the weight of each fertilizer bag, it will tell you how many bags to purchase. Even worse, excess fertilizer can burn your grass or become a source of water pollution. Nitrogen recommendations are usually given in lbs/1000 sq. It should also be noted that the use of potassium fertilizer is a powerful factor for the root system growth, … The soil pH can be adjusted using supplements. Check the bag and read the label of the product you have chosen. Click here for information on soil testing lawns. Use only what your soil needs to prevent leaching, Test your soil to ensure you don't add nutrients that are already present in the soil, Sweep up fertilizer on sidewalks and driveways to prevent it from falling into storm drains, Consider spreading your fertilizer in multiple applications throughout the year but in smaller quantities, Consider using organic fertilizers, which are less prone to leaching and can improve the structure of the soil. Good maintenance type fertilizers should be in a 3-1-2 ratio of nitrogen (N) to phosphorus (P) to potassium (K). An example of a 3-1-2 ratio fertilizer would be a 15-5-10 or something relatively close to this. Your lawn can be broken into multiple geometric shapes, measuring each one, then summed for the total area. The algae multiply, creating large. How Much Am I Applying - Find how much of each nutrient you are applying based on how much fertilizer is applied. By knowing how much of each nutrient your lawn already has, you will save money and prevent over-fertilization. Sulfate of potash or SOP, Potassium chloride (0-0-60) i.e. Soil testing will tell you what nutrients the soil needs as well as what nutrients are in sufficient amounts. Most lawn grass will do well with a pH between 6.5 and 7.0. The N-P-K numbers listed on a fertilizer label tell you what percent of the bag's weight is composed of nitrogen (N), phosphate (P205) and potassium (K20). If the pH is too high or low, the chemical reactions in the soil make it more difficult for the grass to absorb enough P and K. This can lead to poor grass health regardless of whether you applied the correct amount of fertilizer. Just like we humans require a balanced diet for healthy growth, grass also requires certain essential nutrients for normal, healthy growth. Nitrogen deficiency typically results in the yellowing of leaves. Muriate of potash. What does N-P-K on the fertilizer bag stand for? Then multiply square paces by 6.25 to equal square feet. It is important to apply the correct amount of fertilizer per total square footage of your lawn. Sometimes these are present at sufficient levels the soil. Calculating fertilizer amounts based on nitrogen recommendations from an extension person, literature, or soil test report. Enter the amount of nitrogen (N) you … Online calculator. Most grass experts recommend that if you fertilize once a year, the best choice is to fertilize in the fall. Is the grass greener on the other side? Option 2 - Actually measure the size of your lawn with a measuring tape. Measure your lawn with a tape measure or use an online tool such as the Google Area Calculator (link opens in a new window). Determine the recommended rate of Nitrogen. If the lawn was 1.5 acres, we would need: 1.5 acres * 154 lbs fertilizer/acre = 231 lbs of fertilizer. Table 1: Fertilizer Recommendations for Tall Fescue, Kentucky Bluegrass and/or Perennial Ryegrass based on amounts of nitrogen, Table 2: Fertilizer Recommendations for Zoysiagrass, Bermudagrass or Buffalograss based on amounts of nitrogen, Table 3: Fertilizer options to adjust phosphorus or potassium only. Most lawn fertilizer products are designed to cover 5,000 or 7,500 square feet. Some algal blooms also deplete local oxygen levels when the algae die and decompose, creating "dead zones" where fish and other aquatic wildlife cannot survive. Option 3 - Pace-off the lawn area to estimate square paces. Nitrogen only fertilizers with some slow-released nitrogen (See Guaranteed Analysis on bag) can be used if phosphorus and potassium are at adequate levels. A soil test will also tell you if your soil's pH is too high or too low. The calculator ranks various fertilizer combinations, with the best getting the highest score. Direct questions and comments to Kent Shannon. After you've put so much effort sowing grass seed or laying sod, keeping your lawn supplied with sufficient nutrients will help it grow stronger, look greener, and be more resistant to disease and drought. Purdue Turf Fertilizer Calculator How Much Do I Need - Calculate how much fertilizer you need given an nutrient application rate. If you live in colder regions, keep in mind that some fertilizers, including many organic fertilizers, need to be broken down by soil microbes before they will release nitrogen.

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